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f67539c2 TL |
1 | /* |
2 | * Licensed to the Apache Software Foundation (ASF) under one | |
3 | * or more contributor license agreements. See the NOTICE file | |
4 | * distributed with this work for additional information | |
5 | * regarding copyright ownership. The ASF licenses this file | |
6 | * to you under the Apache License, Version 2.0 (the | |
7 | * "License"); you may not use this file except in compliance | |
8 | * with the License. You may obtain a copy of the License at | |
9 | * | |
10 | * http://www.apache.org/licenses/LICENSE-2.0 | |
11 | * | |
12 | * Unless required by applicable law or agreed to in writing, | |
13 | * software distributed under the License is distributed on an | |
14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
15 | * KIND, either express or implied. See the License for the | |
16 | * specific language governing permissions and limitations | |
17 | * under the License. | |
18 | */ | |
19 | ||
20 | package org.apache.thrift.transport; | |
21 | ||
22 | import org.apache.thrift.TByteArrayOutputStream; | |
23 | import java.nio.charset.Charset; | |
24 | ||
25 | /** | |
26 | * Memory buffer-based implementation of the TTransport interface. | |
27 | */ | |
28 | public class TMemoryBuffer extends TTransport { | |
29 | /** | |
30 | * Create a TMemoryBuffer with an initial buffer size of <i>size</i>. The | |
31 | * internal buffer will grow as necessary to accommodate the size of the data | |
32 | * being written to it. | |
33 | * | |
34 | * @param size the initial size of the buffer | |
35 | */ | |
36 | public TMemoryBuffer(int size) { | |
37 | arr_ = new TByteArrayOutputStream(size); | |
38 | } | |
39 | ||
40 | @Override | |
41 | public boolean isOpen() { | |
42 | return true; | |
43 | } | |
44 | ||
45 | @Override | |
46 | public void open() { | |
47 | /* Do nothing */ | |
48 | } | |
49 | ||
50 | @Override | |
51 | public void close() { | |
52 | /* Do nothing */ | |
53 | } | |
54 | ||
55 | @Override | |
56 | public int read(byte[] buf, int off, int len) { | |
57 | byte[] src = arr_.get(); | |
58 | int amtToRead = (len > arr_.len() - pos_ ? arr_.len() - pos_ : len); | |
59 | if (amtToRead > 0) { | |
60 | System.arraycopy(src, pos_, buf, off, amtToRead); | |
61 | pos_ += amtToRead; | |
62 | } | |
63 | return amtToRead; | |
64 | } | |
65 | ||
66 | @Override | |
67 | public void write(byte[] buf, int off, int len) { | |
68 | arr_.write(buf, off, len); | |
69 | } | |
70 | ||
71 | /** | |
72 | * Output the contents of the memory buffer as a String, using the supplied | |
73 | * encoding | |
74 | * @param charset the encoding to use | |
75 | * @return the contents of the memory buffer as a String | |
76 | */ | |
77 | public String toString(Charset charset) { | |
78 | return arr_.toString(charset); | |
79 | } | |
80 | ||
81 | public String inspect() { | |
82 | StringBuilder buf = new StringBuilder(); | |
83 | byte[] bytes = arr_.toByteArray(); | |
84 | for (int i = 0; i < bytes.length; i++) { | |
85 | buf.append(pos_ == i ? "==>" : "" ).append(Integer.toHexString(bytes[i] & 0xff)).append(" "); | |
86 | } | |
87 | return buf.toString(); | |
88 | } | |
89 | ||
90 | // The contents of the buffer | |
91 | private TByteArrayOutputStream arr_; | |
92 | ||
93 | // Position to read next byte from | |
94 | private int pos_; | |
95 | ||
96 | public int length() { | |
97 | return arr_.size(); | |
98 | } | |
99 | ||
100 | public byte[] getArray() { | |
101 | return arr_.get(); | |
102 | } | |
103 | } | |
104 |